Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/08—Anti-corrosive paints

Definitions

• the rust converters known hitherto have an acid reaction. This is a disadvantage, since excess acid can attack the iron and can damage other constituents of the rust converters, for example can render the binder coating brittle.
• the invention therefore relates to an essentially neutral rust converter and rust preventive which reduces the rust to zero valent (i.e. metallic) iron and then protects the iron against further corrosion.
• Suitable trihydroxybenzenes or mixtures of trihydroxybenzenes are pyrogallol (1,2,3-trihydroxybenzene) and hydroxyhydroquinone 1,2,4-trihydroxybenzene) or mixtures thereof. These compounds are powerful reducing agents which reduce the rust to metallic iron.
• the rust converter and rust preventive according to the invention preferably contains the component (b) in amounts of 0.5 to 10 percent by weight, in particular 2.5 to 5 percent by weight.
• the rust converter and rust preventive according to the invention preferably contains a total of 25 to 65% by weight, in particular 55 to 60% by weight, of water.
• This is preferably replaced in part by at least one organic polar solvent, such as lower monohydric alcohols, preferably ethanol, isopropanol or butanol, lower glycols, such as propylene glycol, lower aldehydes, lower halogenated hydrocarbons, esters, such as butyl acetate or glycol acetate, or mixtures thereof.
• organic polar solvents are preferably present in an amount of 2 to 25% by weight, in particular in an amount of approximately 2 to 10% by weight. If the rust converter and rust preventive is to be atomized from spray cans, it can contain up to 20 or 25% by weight of the organic polar solvent.
• the rust converter and rust preventive according to the invention preferably also contains at least one thickener, such as silicic acids, magnesium silicate or hydroxyethylcellulose or mixtures thereof.
• the thickener(s) can be present in amounts of 0.1 to 2% by weight, preferably 0.3% by weight if the agent is a low-viscosity preparation, and up to 3% by weight if it is a paste.
• the rust converter and rust preventive according to the invention can additionally contain the customary plasticizers and/or emulsifiers and/or emulsion stabilizers and/or preservatives and/or anti-foaming agents.
• the content of preservative is preferably 0.01 to 1% by weight, in particular approx. 0.1% by weight, and the content of anti-foaming agent is preferably 0.1 to 1% by weight, in particular approx. 0.1% by weight.
• the rust converter and rust preventive is to be atomized from a spray can, it can contain more anti-foaming agent, preferably up to 5% by weight, in particular 0.5 to 0.6% by weight.
• Vinnapas CEF 10 is a finely particulate plastics dispersion based on a terpolymer of ethylene, vinyl acetate and vinyl chloride (registered product of Wacker-Chemie GmbH, Kunststoff, West Germany).
• the rust converter and rust preventive of the preferred composition thus obtained has the following properties:
• this agent When this agent is applied to steel sheet which has rusted in a normal manner, rust conversion begins after only a few minutes and produces a deep black coloration. If the agent is applied in a layer 6 ⁇ m thick and if this layer is then provided with a coating of synthetic resin paint 40 ⁇ m thick, this coating resists the salt spray test specified by DIN for 500 hours.
• Ercusol I 60 is an aqueous acrylic resin dispersion containing 42% by weight of methacrylic acid/styrene copolymer and, as a crosslinking agent, 4% by weight of amidomethylol methyl ether (registered product of Bayer AG, Leverkusen, West Germany).
• Desavin is a plasticizer (registered product of Bayer AG, Leverkusen, West Germany).
• Natrosol 250 HHR is hydroxyethyl cellulose (registered product of Hercules Inc., Wilmington, Del., USA).
• Vinnapas CEF is a finely particulate plastics dispersion based on a terpolymer of ethylene, vinyl acetate and vinyl chloride (registered product of Wacker-Chemie, Kunststoff, West Germany).
• Desavin is a plasticizer (registered product of Bayer AG, Leverkusen, West Germany).
• the pyrogallol paste consists of 87% by weight of water, 10% by weight of pyrogallol and 3% by weight of Bentone EW, a montmorillonite (registered product of NL Industries, Inc., New York, N.Y., USA).
• Bentone EW a montmorillonite (registered product of NL Industries, Inc., New York, N.Y., USA).
• the Bentone EW is used to stabilize the emulsion.
• the rust converter and rust preventive of the preferred composition thus obtained has the following properties:
• a rust converter and rust preventive is prepared from the following constituents:
• Pliolite is a styrene/butadiene copolymer (registered product of Goodyear Tyre & Rubber Company, Akron, Ohio, USA).
• Bentone EW is a montmorillonite (registered product of NL Industries, Inc., New York, N.Y., USA) and is used to stabilize the emulsion.
• Rust conversion takes place within approx. 30 minutes, and the dried layer can then be painted over with most commercially available top lacquer systems within 24 hours.
• a rust converter and rust preventive is prepared from the following constituents:
• Mowilith DM5 is a polyvinyl acetate dispersion containing emulsifiers incorporated in its structure (registered product of Hoechst AG, Frankfurt-Hochst, West Germany).
• Bentone EW is a montmorillonite (registered product of NL Industries, Inc., New York, N.Y., USA) and is used to stabilize the emulsion.
• Nopco anti-foaming agent 8034 E is a registered product of Nopco Chemical Division, Morristown, N.J., USA, a division of Diamond Shamrock Corp., Cleveland, Ohio, USA.
• the pH of the agent of the preferred composition thus obtained is adjusted to a value of 6.8 by means of approximately 0.4% by weight of aqueous ammonia.
• Laroflex MP 25 is a vinyl chloride copolymer (registered product of BASF AG, Ludwigshafen/Rhein, West Germany).
• the rust converter and rust preventive of the preferred composition thus obtained has a pH of 7.0.
• the rust conversion properties and the capacity for being painted over are the same as those in Examples 4 to 7.
• the products are to be atomized from a spray can, they can be formulated as follows:

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Paints Or Removers (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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Citations (17)

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• 1984
  • 1984-06-29 CH CH3161/84A patent/CH659655A5/de not_active IP Right Cessation
• 1985
  • 1985-06-14 AT AT0178385A patent/AT397252B/de not_active IP Right Cessation
  • 1985-06-14 DE DE19853521386 patent/DE3521386A1/de active Granted
  • 1985-06-24 ZA ZA854750A patent/ZA854750B/xx unknown
  • 1985-06-27 US US06/749,937 patent/US4598114A/en not_active Expired - Lifetime
  • 1985-06-27 SE SE8503201A patent/SE462396B/sv not_active IP Right Cessation
  • 1985-06-27 FR FR858509808A patent/FR2566807B1/fr not_active Expired - Fee Related
  • 1985-06-28 JP JP14142585A patent/JPS6140379A/ja active Granted
  • 1985-06-28 GB GB08516340A patent/GB2160877B/en not_active Expired

Patent Citations (18)

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